The identification of suitable seed cells represents a critical scientific problem to be solved in the field of oral and maxillofacial bone tissue regeneration. The application of adipose-derived stem cells (ASCs) in tissue and organ repair and regeneration has been studied extensively. In recent years, dedifferentiated fat (DFAT) cells have also shown broad application prospects in the field of bone tissue engineering. DFAT cells express stem cell-related markers and have the potential to differentiate into adipocytes, osteoblasts, chondrocytes, nerve cells, cardiomyocytes and endothelial cells. In addition, DFAT cells also have the advantages of minimally invasive acquisition, strong proliferation and high homogeneity. Currently, all studies involving the application of DFAT cells in scaffold-based and scaffold-free bone tissue engineering can confirm their effectiveness in promoting bone regeneration. However, cytological research still faces some challenges, including relatively low cell culture purity, unclear phenotypic characteristics and undefined dedifferentiation mechanisms. It is believed that with the continuous development and improvement of isolation, culture, identification and directional induction of osteogenic differentiation methods, DFAT cells are expected to become excellent seed cells in the field of oral and maxillofacial bone tissue engineering in the future.

The identification of suitable seed cells represents a critical scientific problem to be solved in the field of oral and maxillofacial bone tissue regeneration.The application of adipose-derived stem cells(ASCs)in tissue and organ repair and regeneration has been studied extensively.In recent years,dedifferentiated fat(DFAT)cells have also shown broad application prospects in the field of bone tissue engineering.DFAT cells express stem cell-related markers and have the potential to differentiate into adipocytes,osteoblasts,chondrocytes,nerve cells,cardiomyocytes and endothelial cells.In addition,DFAT cells also have the advantages of minimally invasive acquisition,strong proliferation and high homogeneity.Currently,all studies involving the application of DFAT cells in scaffold-based and scaffold-free bone tis-sue engineering can confirm their effectiveness in promoting bone regeneration.However,cytological research still faces some challenges,including relatively low cell culture purity,unclear phenotypic characteristics and undefined dediffer-entiation mechanisms.It is believed that with the continuous development and improvement of isolation,culture,identi-fication and directional induction of osteogenic differentiation methods,DFAT cells are expected to become excellent seed cells in the field of oral and maxillofacial bone tissue engineering in the future.

The identification of suitable seed cells represents a critical scientific problem to be solved in the field of oral and maxillofacial bone tissue regeneration.The application of adipose-derived stem cells(ASCs)in tissue and organ repair and regeneration has been studied extensively.In recent years,dedifferentiated fat(DFAT)cells have also shown broad application prospects in the field of bone tissue engineering.DFAT cells express stem cell-related markers and have the potential to differentiate into adipocytes,osteoblasts,chondrocytes,nerve cells,cardiomyocytes and endothelial cells.In addition,DFAT cells also have the advantages of minimally invasive acquisition,strong proliferation and high homogeneity.Currently,all studies involving the application of DFAT cells in scaffold-based and scaffold-free bone tis-sue engineering can confirm their effectiveness in promoting bone regeneration.However,cytological research still faces some challenges,including relatively low cell culture purity,unclear phenotypic characteristics and undefined dediffer-entiation mechanisms.It is believed that with the continuous development and improvement of isolation,culture,identi-fication and directional induction of osteogenic differentiation methods,DFAT cells are expected to become excellent seed cells in the field of oral and maxillofacial bone tissue engineering in the future.

The identification of suitable seed cells represents a critical scientific problem to be solved in the field of oral and maxillofacial bone tissue regeneration.The application of adipose-derived stem cells(ASCs)in tissue and organ repair and regeneration has been studied extensively.In recent years,dedifferentiated fat(DFAT)cells have also shown broad application prospects in the field of bone tissue engineering.DFAT cells express stem cell-related markers and have the potential to differentiate into adipocytes,osteoblasts,chondrocytes,nerve cells,cardiomyocytes and endothelial cells.In addition,DFAT cells also have the advantages of minimally invasive acquisition,strong proliferation and high homogeneity.Currently,all studies involving the application of DFAT cells in scaffold-based and scaffold-free bone tis-sue engineering can confirm their effectiveness in promoting bone regeneration.However,cytological research still faces some challenges,including relatively low cell culture purity,unclear phenotypic characteristics and undefined dediffer-entiation mechanisms.It is believed that with the continuous development and improvement of isolation,culture,identi-fication and directional induction of osteogenic differentiation methods,DFAT cells are expected to become excellent seed cells in the field of oral and maxillofacial bone tissue engineering in the future.

The identification of suitable seed cells represents a critical scientific problem to be solved in the field of oral and maxillofacial bone tissue regeneration.The application of adipose-derived stem cells(ASCs)in tissue and organ repair and regeneration has been studied extensively.In recent years,dedifferentiated fat(DFAT)cells have also shown broad application prospects in the field of bone tissue engineering.DFAT cells express stem cell-related markers and have the potential to differentiate into adipocytes,osteoblasts,chondrocytes,nerve cells,cardiomyocytes and endothelial cells.In addition,DFAT cells also have the advantages of minimally invasive acquisition,strong proliferation and high homogeneity.Currently,all studies involving the application of DFAT cells in scaffold-based and scaffold-free bone tis-sue engineering can confirm their effectiveness in promoting bone regeneration.However,cytological research still faces some challenges,including relatively low cell culture purity,unclear phenotypic characteristics and undefined dediffer-entiation mechanisms.It is believed that with the continuous development and improvement of isolation,culture,identi-fication and directional induction of osteogenic differentiation methods,DFAT cells are expected to become excellent seed cells in the field of oral and maxillofacial bone tissue engineering in the future.

The identification of suitable seed cells represents a critical scientific problem to be solved in the field of oral and maxillofacial bone tissue regeneration.The application of adipose-derived stem cells(ASCs)in tissue and organ repair and regeneration has been studied extensively.In recent years,dedifferentiated fat(DFAT)cells have also shown broad application prospects in the field of bone tissue engineering.DFAT cells express stem cell-related markers and have the potential to differentiate into adipocytes,osteoblasts,chondrocytes,nerve cells,cardiomyocytes and endothelial cells.In addition,DFAT cells also have the advantages of minimally invasive acquisition,strong proliferation and high homogeneity.Currently,all studies involving the application of DFAT cells in scaffold-based and scaffold-free bone tis-sue engineering can confirm their effectiveness in promoting bone regeneration.However,cytological research still faces some challenges,including relatively low cell culture purity,unclear phenotypic characteristics and undefined dediffer-entiation mechanisms.It is believed that with the continuous development and improvement of isolation,culture,identi-fication and directional induction of osteogenic differentiation methods,DFAT cells are expected to become excellent seed cells in the field of oral and maxillofacial bone tissue engineering in the future.

The identification of suitable seed cells represents a critical scientific problem to be solved in the field of oral and maxillofacial bone tissue regeneration.The application of adipose-derived stem cells(ASCs)in tissue and organ repair and regeneration has been studied extensively.In recent years,dedifferentiated fat(DFAT)cells have also shown broad application prospects in the field of bone tissue engineering.DFAT cells express stem cell-related markers and have the potential to differentiate into adipocytes,osteoblasts,chondrocytes,nerve cells,cardiomyocytes and endothelial cells.In addition,DFAT cells also have the advantages of minimally invasive acquisition,strong proliferation and high homogeneity.Currently,all studies involving the application of DFAT cells in scaffold-based and scaffold-free bone tis-sue engineering can confirm their effectiveness in promoting bone regeneration.However,cytological research still faces some challenges,including relatively low cell culture purity,unclear phenotypic characteristics and undefined dediffer-entiation mechanisms.It is believed that with the continuous development and improvement of isolation,culture,identi-fication and directional induction of osteogenic differentiation methods,DFAT cells are expected to become excellent seed cells in the field of oral and maxillofacial bone tissue engineering in the future.

The identification of suitable seed cells represents a critical scientific problem to be solved in the field of oral and maxillofacial bone tissue regeneration.The application of adipose-derived stem cells(ASCs)in tissue and organ repair and regeneration has been studied extensively.In recent years,dedifferentiated fat(DFAT)cells have also shown broad application prospects in the field of bone tissue engineering.DFAT cells express stem cell-related markers and have the potential to differentiate into adipocytes,osteoblasts,chondrocytes,nerve cells,cardiomyocytes and endothelial cells.In addition,DFAT cells also have the advantages of minimally invasive acquisition,strong proliferation and high homogeneity.Currently,all studies involving the application of DFAT cells in scaffold-based and scaffold-free bone tis-sue engineering can confirm their effectiveness in promoting bone regeneration.However,cytological research still faces some challenges,including relatively low cell culture purity,unclear phenotypic characteristics and undefined dediffer-entiation mechanisms.It is believed that with the continuous development and improvement of isolation,culture,identi-fication and directional induction of osteogenic differentiation methods,DFAT cells are expected to become excellent seed cells in the field of oral and maxillofacial bone tissue engineering in the future.

The identification of suitable seed cells represents a critical scientific problem to be solved in the field of oral and maxillofacial bone tissue regeneration.The application of adipose-derived stem cells(ASCs)in tissue and organ repair and regeneration has been studied extensively.In recent years,dedifferentiated fat(DFAT)cells have also shown broad application prospects in the field of bone tissue engineering.DFAT cells express stem cell-related markers and have the potential to differentiate into adipocytes,osteoblasts,chondrocytes,nerve cells,cardiomyocytes and endothelial cells.In addition,DFAT cells also have the advantages of minimally invasive acquisition,strong proliferation and high homogeneity.Currently,all studies involving the application of DFAT cells in scaffold-based and scaffold-free bone tis-sue engineering can confirm their effectiveness in promoting bone regeneration.However,cytological research still faces some challenges,including relatively low cell culture purity,unclear phenotypic characteristics and undefined dediffer-entiation mechanisms.It is believed that with the continuous development and improvement of isolation,culture,identi-fication and directional induction of osteogenic differentiation methods,DFAT cells are expected to become excellent seed cells in the field of oral and maxillofacial bone tissue engineering in the future.

Objective To understand the changing distribution and antimicrobial resistance profiles of Klebsiella strains in 52 hospitals across China in the CHINET Antimicrobial Resistance Surveillance Program from 2015 to 2021.Methods Antimicrobial susceptibility testing was carried out according to the unified CHINET protocol.The susceptibility results were interpreted according to the breakpoints in the Clinical & Laboratory Standards Institute(CLSI)M100 document.Results A total of 241,549 nonduplicate Klebsiella strains were isolated from 2015 to 2021,including Klebsiella pneumoniae(88.0％),Klebsiella aerogenes(5.8％),Klebsiella oxytoca(5.7％),and other Klebsiella species(0.6％).Klebsiella strains were mainly isolated from respiratory tract(48.49±5.32)％.Internal medicine(22.79±3.28)％,surgery(17.98±3.10)％,and ICU(14.03±1.39)％were the top 3 departments where Klebsiella strains were most frequently isolated.K.pneumoniae isolates showed higher resistance rate to most antimicrobial agents compared to other Klebsiella species.Klebsiella isolates maintained low resistance rates to tigecycline and polymyxin B.ESBLs-producing K.pneumoniae and K.oxytoca strains showed higher resistance rates to all the antimicrobial agents tested compared to the corresponding ESBLs-nonproducing strains.The K.pneumoniae and carbapenem-resistant K.pneumoniae(CRKP)strains isolated from ICU patients demonstrated higher resistance rates to majority of the antimicrobial agents tested than the strains isolated from non-ICU patients.The CRKP strains isolated from adult patients had higher resistance rates to most of the antimicrobial agents tested than the corresponding CRKP strains isolated from paediatric patients.Conclusions The prevalence of carbapenem-resistant strains in Klebsiella isolates increased greatly from 2015 to 2021.However,the Klebsiella isolates remained highly susceptible to tigecycline and polymyxin B.Antimicrobial resistance surveillance should still be strengthened for Klebsiella strains.